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arcane
01
奥義の
requiring specialized or secret knowledge to comprehend fully
例
The symbols engraved on the ancient artifact were arcane, their meaning decipherable only by expert archaeologists.
The inner workings of the organization were kept arcane, known only to a select few members.
The techniques used in traditional Chinese medicine can seem arcane to those unfamiliar with its principles.
The language used in the ancient manuscript was arcane, understood only by scholars well-versed in ancient texts.
The ancient rituals performed by the tribe were considered arcane, known only to the elders.
